netdev - Re: [PATCH net-next] net: stmmac: dwmac-qcom-ethqos: Update link clock rate only for RGMII

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Date: Thu, 22 Feb 2024 14:01:44 +0100
From: Konrad Dybcio <konrad.dybcio@...aro.org>
To: Sarosh Hasan <quic_sarohasa@...cinc.com>, Vinod Koul <vkoul@...nel.org>,
 Bhupesh Sharma <bhupesh.sharma@...aro.org>, Andy Gross <agross@...nel.org>,
 Bjorn Andersson <andersson@...nel.org>, "David S. Miller"
 <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>,
 Jakub Kicinski <kuba@...nel.org>, Rob Herring <robh+dt@...nel.org>,
 Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
 Conor Dooley <conor+dt@...nel.org>,
 Alexandre Torgue <alexandre.torgue@...s.st.com>,
 Jose Abreu <joabreu@...opsys.com>,
 Maxime Coquelin <mcoquelin.stm32@...il.com>, netdev@...r.kernel.org,
 linux-arm-msm@...r.kernel.org, devicetree@...r.kernel.org,
 linux-kernel@...r.kernel.org, linux-stm32@...md-mailman.stormreply.com,
 Prasad Sodagudi <psodagud@...cinc.com>, Andrew Halaney
 <ahalaney@...hat.com>, Rob Herring <robh@...nel.org>
Cc: kernel@...cinc.com, Sneh Shah <quic_snehshah@...cinc.com>,
 Suraj Jaiswal <quic_jsuraj@...cinc.com>
Subject: Re: [PATCH net-next] net: stmmac: dwmac-qcom-ethqos: Update link
 clock rate only for RGMII

On 2/22/24 13:55, Sarosh Hasan wrote:
> Updating link clock rate for different speeds is only needed when
> using RGMII, as that mode requires changing clock speed when the link
> speed changes. Let's restrict updating the link clock speed in
> ethqos_update_link_clk() to just RGMII. Other modes such as SGMII
> only need to enable the link clock (which is already done in probe).
> 
> Signed-off-by: Sarosh Hasan <quic_sarohasa@...cinc.com>
> ---
>   .../stmicro/stmmac/dwmac-qcom-ethqos.c        | 26 ++++++++++---------
>   1 file changed, 14 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
> index 31631e3f89d0..9cd144fb3005 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-qcom-ethqos.c
> @@ -169,21 +169,23 @@ static void rgmii_dump(void *priv)
>   static void
>   ethqos_update_link_clk(struct qcom_ethqos *ethqos, unsigned int speed)
>   {
> -	switch (speed) {
> -	case SPEED_1000:
> -		ethqos->link_clk_rate =  RGMII_1000_NOM_CLK_FREQ;
> -		break;
> +	if (phy_interface_mode_is_rgmii(ethqos->phy_mode)) {
> +		switch (speed) {
> +		case SPEED_1000:
> +			ethqos->link_clk_rate =  RGMII_1000_NOM_CLK_FREQ;
> +			break;
>   
> -	case SPEED_100:
> -		ethqos->link_clk_rate =  RGMII_ID_MODE_100_LOW_SVS_CLK_FREQ;
> -		break;
> +		case SPEED_100:
> +			ethqos->link_clk_rate =  RGMII_ID_MODE_100_LOW_SVS_CLK_FREQ;
> +			break;
>   
> -	case SPEED_10:
> -		ethqos->link_clk_rate =  RGMII_ID_MODE_10_LOW_SVS_CLK_FREQ;
> -		break;
> -	}
> +		case SPEED_10:
> +			ethqos->link_clk_rate =  RGMII_ID_MODE_10_LOW_SVS_CLK_FREQ;
> +			break;
> +		}
>   
> -	clk_set_rate(ethqos->link_clk, ethqos->link_clk_rate);
> +		clk_set_rate(ethqos->link_clk, ethqos->link_clk_rate);
> +	}
>   }

if (!phy_interface_mode_is_rgmii(ethqos->phy_mode))
	return 0;

[leave the rest unchanged]

?

Konrad